Ham Radio Technician Flashcards: 90 Core Concepts for 2026-2030
Review 90 core concepts for the 2026–2030 U.S. Technician Class exam across all ten NCVEC subelements.
حول هذه الرزمة
Prepare for the U.S. Technician Class (Element 2) exam pool in effect from July 1, 2026, through June 30, 2030. These 90 core-concept flashcards use one-target prompts, direct answers, and brief explanations across all ten official NCVEC subelements.
This compact deck complements—not replaces—the full 409-question pool, randomized 35-question practice exams, and the three official diagrams. It does not reproduce the official multiple-choice wording, choices, distractors, or answer letters, and it does not claim full-pool coverage.
Facts were checked against the corrected February 19, 2026 NCVEC pool and current 47 CFR Part 97. Card wording and explanations are original. This independent study resource is not affiliated with or endorsed by NCVEC, the FCC, or any examination team. Consult the official pool at https://ncvec.org/index.php/2026-2030-technician-question-pool.
بطاقات هذه الرزمة
البطاقة ١
السؤال
Which component is commonly used as an adjustable volume control?
الإجابة
A potentiometer. It is a variable resistor with a movable contact.
البطاقة ٢
السؤال
Which U.S. agency regulates and enforces the Amateur Radio Service rules?
الإجابة
The Federal Communications Commission (FCC). It administers the rules that govern U.S. amateur stations.
البطاقة ٣
السؤال
Which common voice mode uses less bandwidth: SSB or FM?
الإجابة
SSB uses less bandwidth. This makes it well suited to crowded HF spectrum.
البطاقة ٤
السؤال
What determines a radio wave’s polarization?
الإجابة
The orientation of its electric field.
البطاقة ٥
السؤال
What power-supply rating is typical for a 50-watt mobile FM transceiver?
الإجابة
About 13.8 volts at 12 amperes. The current rating must cover the radio’s transmit demand.
البطاقة ٦
السؤال
What is an amateur band plan?
الإجابة
A voluntary guide for using different modes and activities within a band. It supplements—not replaces—FCC frequency privileges.
البطاقة ٧
السؤال
How fast does a radio wave travel through free space?
الإجابة
At the speed of light. Radio waves are electromagnetic waves.
البطاقة ٨
السؤال
What is a fuse designed to do during an electrical overload?
الإجابة
Open the circuit and remove power. It protects wiring and equipment from excessive current.
البطاقة ٩
السؤال
What electrical quantity causes electrons to flow in a circuit?
الإجابة
Voltage, or electrical potential difference. Current is the resulting flow of charge.
البطاقة ١٠
السؤال
When the station licensee and control operator are different people, who is responsible for proper station operation?
الإجابة
Both are equally responsible. The station licensee and the control operator share responsibility for compliance.
البطاقة ١١
السؤال
Which two major radio functions are combined inside a transceiver?
الإجابة
A transmitter and a receiver. Both functions are combined in one unit.
البطاقة ١٢
السؤال
Which component stores energy in an electric field?
الإجابة
A capacitor.
البطاقة ١٣
السؤال
What is the defining radiation-pattern advantage of a beam antenna?
الإجابة
It concentrates radiation in one direction.
البطاقة ١٤
السؤال
What bandwidth is typical for an SSB voice signal?
الإجابة
About 3 kHz.
البطاقة ١٥
السؤال
What is a clear way to begin a voice CQ call?
الإجابة
Say “CQ” a few times, then “this is” and your call sign; pause and listen before repeating.
البطاقة ١٦
السؤال
Where does an RF power meter belong when measuring transmitter output to an antenna?
الإجابة
In the feed line between the transmitter and the antenna.
البطاقة ١٧
السؤال
How often must an amateur station identify during a communication?
الإجابة
At least every 10 minutes and at the end of the communication. A tactical identifier does not replace the assigned call sign.
البطاقة ١٨
السؤال
What unit measures electric current?
الإجابة
The ampere (amp).
البطاقة ١٩
السؤال
Where should a fuse or circuit breaker go in a 120-volt AC circuit?
الإجابة
In series with the hot conductor only. Do not put the protective device only in the neutral conductor.
البطاقة ٢٠
السؤال
How does wavelength change when frequency increases?
الإجابة
Wavelength decreases. Frequency and wavelength are inversely related when propagation speed is fixed.
البطاقة ٢١
السؤال
What does receiver sensitivity describe?
الإجابة
The ability to detect weak signals. Better sensitivity means a weaker usable signal can be received.
البطاقة ٢٢
السؤال
Which component stores energy in a magnetic field?
الإجابة
An inductor.
البطاقة ٢٣
السؤال
What does antenna gain describe?
الإجابة
Signal-strength improvement in a chosen direction compared with a reference antenna. Gain redistributes radiation rather than creating transmitter power.
البطاقة ٢٤
السؤال
What 10-meter frequency range gives a Technician voice privileges?
الإجابة
28.300 to 28.500 MHz. This is the Technician phone segment on 10 meters.
البطاقة ٢٥
السؤال
What does simplex operation mean?
الإجابة
Both stations transmit and receive on the same frequency. No repeater frequency pair is involved.
البطاقة ٢٦
السؤال
What bandwidth is typical for a VHF repeater FM voice signal?
الإجابة
About 10 to 15 kHz.
البطاقة ٢٧
السؤال
How many milliamperes are in 1.5 amperes?
الإجابة
1,500 milliamperes. Multiply amperes by 1,000.
البطاقة ٢٨
السؤال
What conductor is preferred for RF bonding between station equipment?
الإجابة
Flat copper strap.
البطاقة ٢٩
السؤال
What hazard can rapid charging or discharging create in an unprotected battery?
الإجابة
Overheating or out-gassing. Use the battery’s specified protection and charge limits.
البطاقة ٣٠
السؤال
Which semiconductor component normally allows current in only one direction?
الإجابة
A diode.
البطاقة ٣١
السؤال
When may a newly licensed amateur first transmit?
الإجابة
After the license grant appears in the FCC license database. Passing the exam alone does not authorize transmission.
البطاقة ٣٢
السؤال
What does receiver selectivity describe?
الإجابة
The ability to separate a desired signal from signals on nearby frequencies.
البطاقة ٣٣
السؤال
What repeater offset is commonly used on the 2-meter band?
الإجابة
Plus or minus 600 kHz. The sign depends on the repeater’s input/output pair.
البطاقة ٣٤
السؤال
What shortcut estimates wavelength in meters from frequency in megahertz?
الإجابة
Divide 300 by the frequency in MHz.
wavelength (m) ≈ 300 / frequency (MHz)البطاقة ٣٥
السؤال
What happens to a dipole’s resonant frequency when the antenna is shortened?
الإجابة
The resonant frequency increases. A shorter dipole resonates at a shorter wavelength and therefore a higher frequency.
البطاقة ٣٦
السؤال
Which electrical property describes energy storage in an electric field?
الإجابة
Capacitance. Its unit is the farad.
البطاقة ٣٧
السؤال
What is Doppler shift?
الإجابة
A change in observed frequency caused by relative motion between transmitter and receiver. Satellite operators compensate for it as the spacecraft passes.
البطاقة ٣٨
السؤال
What should an antenna installer do about nearby overhead electrical wires?
الإجابة
Locate them first and stay clear of them. This is an installation-safety rule, not an RF operating technique.
البطاقة ٣٩
السؤال
Where should a mobile transceiver’s negative power return connect in a vehicle?
الإجابة
At the 12-volt battery’s chassis-ground connection. Follow the radio and vehicle installation instructions when making the connection.
البطاقة ٤٠
السؤال
Which amateur transmissions may use deliberately obscured message content?
الإجابة
Commands to space stations or radio-controlled models. Ordinary amateur messages may not be encoded to hide their meaning.
البطاقة ٤١
السؤال
Which semiconductor component can act as an electronic switch?
الإجابة
A transistor. It can control a larger current with a smaller input signal.
البطاقة ٤٢
السؤال
What repeater offset is commonly used on the 70-centimeter band?
الإجابة
Plus or minus 5 MHz.
البطاقة ٤٣
السؤال
What simple device can suppress RF feedback traveling on a microphone cable?
الإجابة
A ferrite choke. It adds impedance to unwanted common-mode RF current on the cable.
البطاقة ٤٤
السؤال
What does a loading coil do in a shortened antenna?
الإجابة
It electrically lengthens the antenna. The added inductive reactance helps a physically short radiator resonate lower.
البطاقة ٤٥
السؤال
Which electrical property describes energy storage in a magnetic field?
الإجابة
Inductance. Its unit is the henry.
البطاقة ٤٦
السؤال
Which polarization is normally used for long-distance VHF/UHF CW and SSB contacts?
الإجابة
Horizontal polarization.
البطاقة ٤٧
السؤال
What is the maximum transmitter power in the HF segments available to a Technician?
الإجابة
200 watts PEP. That ceiling applies to the Technician HF segments, including 28.0–28.5 MHz.
البطاقة ٤٨
السؤال
How much clearance should a new antenna have from power wires?
الإجابة
Enough that no part of the antenna can come within 10 feet of the wires if it falls.
البطاقة ٤٩
السؤال
About how long does a low-Earth-orbit amateur satellite take to circle Earth?
الإجابة
About 100 minutes.
البطاقة ٥٠
السؤال
What happens when an SSB transmitter’s microphone gain is set too high?
الإجابة
The transmitted audio becomes distorted.
البطاقة ٥١
السؤال
What does a CTCSS tone do in repeater operation?
الإجابة
It provides a subaudible access tone that can open the repeater receiver. It does not encrypt the conversation.
البطاقة ٥٢
السؤال
What does a schematic diagram show?
الإجابة
Electrical connections using standardized component symbols. It describes circuit function, not physical placement.
البطاقة ٥٣
السؤال
What formula gives DC electrical power from voltage and current?
الإجابة
P = E × I. For example, 12 volts at 2 amperes is 24 watts.البطاقة ٥٤
السؤال
Where is a half-wave dipole’s radiation strongest?
الإجابة
Broadside to the wire. Radiation is weakest off the ends.
البطاقة ٥٥
السؤال
How long is a normal U.S. amateur radio license term?
الإجابة
10 years. Renewal is required to continue operating after the term expires.
البطاقة ٥٦
السؤال
What load should replace an antenna for transmitter tests that should not radiate a signal?
الإجابة
A dummy load. It absorbs RF power while presenting a suitable impedance to the transmitter.
البطاقة ٥٧
السؤال
What is a proper grounding arrangement for a tower?
الإجابة
Use a separate eight-foot ground rod at each tower leg, bonded to the tower and to the other rods. Follow applicable electrical codes and local requirements.
البطاقة ٥٨
السؤال
Why can a VHF signal change sharply when an antenna moves only a few feet?
الإجابة
Multipath propagation. Reflected signal paths can add or cancel at nearby points.
البطاقة ٥٩
السؤال
How can an operator judge suitable uplink power through a linear amateur satellite transponder?
الإجابة
Keep the received downlink signal about as strong as the satellite beacon.
البطاقة ٦٠
السؤال
What is a DMR color code?
الإجابة
A repeater access code used by DMR systems. It is not a description of display color or signal quality.
البطاقة ٦١
السؤال
What does a power-supply rectifier do?
الإجابة
It changes AC into a varying or pulsating DC voltage. Filtering can then smooth that voltage.
البطاقة ٦٢
السؤال
Which receiver control corrects a returned SSB voice that sounds too high or too low in pitch?
الإجابة
The RIT, also called the clarifier. It shifts the receive tuning enough to restore natural voice pitch.
البطاقة ٦٣
السؤال
When may a U.S. amateur station normally relay a third party’s message to a station in another country?
الإجابة
When that country has a third-party communications arrangement with the United States. Emergency or disaster-relief traffic has a separate exception.
البطاقة ٦٤
السؤال
What form of Ohm’s law gives current from voltage and resistance?
الإجابة
I = E / R. For example, 12 volts across 6 ohms produces 2 amperes.البطاقة ٦٥
السؤال
How does coaxial-cable loss change as signal frequency increases?
الإجابة
Loss increases. The same cable run usually wastes more power at higher frequencies.
البطاقة ٦٦
السؤال
What does a 4:1 SWR indicate?
الإجابة
A serious impedance mismatch. It is much worse than the near-1:1 match a transmitter normally prefers.
البطاقة ٦٧
السؤال
Are amateur radio signals ionizing or non-ionizing radiation?
الإجابة
Non-ionizing radiation. RF exposure still requires compliance with FCC limits.
البطاقة ٦٨
السؤال
What is the general maximum transmitter power for Technician operation above 30 MHz?
الإجابة
1,500 watts PEP, unless a narrower rule sets a lower limit. In actual operation, Part 97 also requires using only the power needed for the communication.
البطاقة ٦٩
السؤال
What does a DMR talkgroup identify?
الإجابة
A logical group of users or traffic on a DMR system. It routes a transmission to the intended group.
البطاقة ٧٠
السؤال
What is a Maidenhead grid locator?
الإجابة
A letter-and-number designator for a geographic area. Operators exchange it to describe station location compactly.
البطاقة ٧١
السؤال
Which component uses an electrical control signal to open or close contacts in another circuit?
الإجابة
A relay. It is an electrically controlled switch.
البطاقة ٧٢
السؤال
Which electrical quantity is the same through every component in a series circuit?
الإجابة
Current. A series circuit has only one current path.
البطاقة ٧٣
السؤال
Why is the VHF/UHF radio horizon usually a little farther than the visual horizon?
الإجابة
The atmosphere refracts radio waves slightly. This modest bending extends the practical radio horizon.
البطاقة ٧٤
السؤال
How should receiver filter bandwidth be set to reduce noise and nearby interference?
الإجابة
Use the narrowest bandwidth that still passes the desired signal. Different modes need different practical widths.
البطاقة ٧٥
السؤال
What is the main function of an antenna tuner?
الإجابة
To match the antenna system’s impedance to the transceiver’s output impedance. It helps the transmitter see a suitable load.
البطاقة ٧٦
السؤال
What does Part 97 say about deliberately disrupting another radio communication?
الإجابة
Willful or malicious interference is prohibited. Frequency use is shared, not assigned exclusively to one station.
البطاقة ٧٧
السؤال
How is a voltmeter connected to measure voltage across a component?
الإجابة
In parallel with the component.
البطاقة ٧٨
السؤال
Why does duty cycle matter in an RF exposure evaluation?
الإجابة
It changes average exposure. A transmitter active for a smaller fraction of the averaging period contributes less average RF energy.
البطاقة ٧٩
السؤال
What is the central job of a net control station?
الإجابة
Call the net to order and direct participating stations. Net control organizes check-ins and traffic flow.
البطاقة ٨٠
السؤال
Which electrical quantity is the same across every branch of a parallel circuit?
الإجابة
Voltage. Each branch connects across the same two nodes.
البطاقة ٨١
السؤال
Which component can step 120-volt AC down to a lower AC voltage?
الإجابة
A transformer.
البطاقة ٨٢
السؤال
What does APRS commonly provide?
الإجابة
Real-time tactical digital communication, including station positions shown on a map.
البطاقة ٨٣
السؤال
When a DMR radio’s channels, repeater settings, contacts, and talkgroups are saved together, what is that data set called?
الإجابة
A DMR code plug. It is the radio’s configuration data set.
البطاقة ٨٤
السؤال
What does standing wave ratio measure in a feed line?
الإجابة
How well the load impedance matches the feed line. An SWR near 1:1 indicates a close match.
البطاقة ٨٥
السؤال
What can an operator do during the two-year filing grace period after an amateur license expires?
الإجابة
Apply for renewal, but do not transmit until the license is renewed. The grace period preserves a renewal path, not operating privileges.
البطاقة ٨٦
السؤال
Which propagation mode can produce occasional strong 10-, 6-, and 2-meter contacts beyond the normal radio horizon?
الإجابة
Sporadic E. It can briefly carry signals well beyond ordinary VHF line-of-sight range.
البطاقة ٨٧
السؤال
Do Part 97 rules stop applying during ARES, RACES, FEMA, or emergency operations?
الإجابة
No. FCC amateur radio rules always apply. Emergency conditions may activate specific provisions, but they do not erase Part 97.
البطاقة ٨٨
السؤال
Who is responsible for keeping people below FCC RF exposure limits at an amateur station?
الإجابة
The station licensee. This is a compliance responsibility; practical evaluations can use calculation, modeling, or calibrated measurement.
البطاقة ٨٩
السؤال
How is an ammeter connected to measure current in a circuit?
الإجابة
In series with the circuit path.
البطاقة ٩٠
السؤال
What decibel change represents doubling transmitter power from 5 watts to 10 watts?
الإجابة
About +3 dB. A 3 dB increase corresponds to roughly twice the power.
٩٠ بطاقة
Ham Radio Technician Flashcards: 90 Core Concepts for 2026-2030
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